Milwaukee SDS-MAX MX4 1" X 12 X 17" features the MILWAUKEE® MX4™ 4-Cutter SDS Max Rotary Hammer Drill Bits designed with a solid head carbide that delivers up to 5 times longer life when drilling through concrete with rebar. These bits are engineered with durable rebar guards to withstand tough aggregate and rebar conditions. Milwaukee’s MX4™ 4-Cutter design includes sharp centering tips for precise spot drilling in concrete, while the integrated 4-cutter prevents lock-up in rebar, minimizing downtime. Optimized flutes enhance dust removal, reduce heat buildup, and provide up to 15% more holes per battery charge. A wear mark indicator on each bit lets you know when it no longer meets ANSI standards. These drill bits are i for concrete with rebar and masonry applications, combining durability and efficiency for professional use. Model Number: 48-20-3953